<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>html5</title>
</head>
<body>
    <img src="images/superman.png" alt="图片无法显示" height="400" width="400">
    <a href="http://www.baidu.com">
        百度一下
    </a>
    <br>
    <a href="test/test4.html">test4超链接</a>
    <br>
    <audio src="audio/music.mp3" controls="controls" loop="loop" autoplay="autoplay">
        此浏览器不支持音频文件
    </audio>
    <br>
    <video src="video/young.mp4" controls="controls" loop="loop" autoplay="autoplay" 
       height="400" width="600">
        此浏览器不支持视频文件
    </video>
</body>
</html>